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SAT® Math

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Difficult

Messy Exponents

SATMAT-JHZJY4

If $ { 125 }^{ x+1 }={ 625 }^{ x } $ and $ 2x+3y=24 $, then what is the value of $ xy $?

(Calculator)

A

$ 24 $

B

$ 21 $

C

$ 18 $

D

$ 15 $